CN112178965B - Qi tonifying regulation method - Google Patents
Qi tonifying regulation method Download PDFInfo
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- CN112178965B CN112178965B CN202010984911.8A CN202010984911A CN112178965B CN 112178965 B CN112178965 B CN 112178965B CN 202010984911 A CN202010984911 A CN 202010984911A CN 112178965 B CN112178965 B CN 112178965B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
Abstract
The invention provides a gas supplementing adjusting method, relates to the technical field of air conditioning equipment, and solves the technical problem that the existing water chilling unit does not perform adjustable control on gas supplementing. The water chilling unit comprises a two-stage compressor, a condenser, a flash tank and an evaporator, wherein an air supply pipe is arranged between the flash tank and the two-stage compressor, the outlet of the air supply pipe is communicated between a first-stage impeller and a second-stage impeller of the two-stage compressor, and an adjusting valve is arranged in the air supply pipe; and a first pressure sensor is arranged in the condenser, a second pressure sensor is arranged in the evaporator, and a third pressure sensor is arranged in the flash tank. The regulating valve is controlled by comparing the flash pressure with the intermediate pressure when the water chilling unit operates normally, if the flash pressure is less than or equal to the intermediate pressure, the regulating valve is closed, the air supplement amount is reduced, if the flash pressure is greater than the intermediate pressure, the large regulating valve is opened, the air supplement amount is increased, the pressure ratio of the first-stage impeller and the second-stage impeller is matched more, and the operation energy efficiency of the water chilling unit is improved.
Description
Technical Field
The invention relates to the technical field of air conditioning equipment, in particular to a gas supplementing adjusting method.
Background
At present, centrifugal water chilling units mostly adopt a two-stage compressor. In order to further improve the operation energy efficiency of the unit, an intermediate economizer (namely a flash tank) is arranged. Liquid refrigerant at the bottom of the condenser enters the flash evaporator after being subjected to primary throttling, wherein liquid refrigerant of the flash evaporator enters the evaporator after being subjected to secondary throttling, and gas refrigerant is directly supplemented into a secondary impeller of the compressor and then compressed. Because the part of gas supplemented into the compressor from the flash tank is not compressed by the first-stage impeller, the power consumption of the part of compressor is saved, and the energy efficiency of the unit is improved.
The applicant has found that the prior art has at least the following technical problems:
the existing double-stage compression centrifugal water chilling unit does not perform adjustable control on air supplement, and a gas refrigerant is directly supplemented into a second-stage impeller of a compressor from a flash tank for compression, so that the running energy efficiency of the unit is improved, but certain defects exist: (1) the flow of the secondary impeller gas refrigerant is increased in the starting process of the compressor, so that the loaded starting of a motor is easily caused, and the starting current is increased; (2) the gas refrigerant supplemented into the compressor from the flash tank inevitably has some liquid drops, and when the gas supplementing amount is too large, the gas supplementing and liquid carrying of the compressor are easily caused, the power consumption of the compressor is increased, and the impeller of the compressor is easily damaged; (3) when the water chilling unit operates at partial load, if the air supplement amount of the compressor is large, the flow difference between a first-stage impeller and a second-stage impeller of the compressor is large, the pressure ratio of the two-stage impeller is not matched, and the highest-efficiency operation cannot be achieved; (4) when the water chilling unit operates at low load, the middle air supplement is more, the capacity unloading of the water chilling unit is not facilitated, and the adjusting range of the unit is reduced.
Disclosure of Invention
The invention aims to provide an air supplement adjusting method to solve the technical problem that the air supplement of a water chilling unit is not adjustably controlled in the prior art. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a water chilling unit which comprises a two-stage compressor, a condenser, a flash tank and an evaporator, wherein an air supplementing pipe is arranged between the flash tank and the two-stage compressor, the outlet of the air supplementing pipe is communicated between a first-stage impeller and a second-stage impeller of the two-stage compressor, and an adjusting valve is arranged in the air supplementing pipe; and a first pressure sensor is arranged in the condenser, a second pressure sensor is arranged in the evaporator, and a third pressure sensor is arranged in the flash tank.
Optionally, a temperature sensor is disposed on the discharge pipe of the two-stage compressor.
Optionally, the regulating valve is an electric butterfly valve, an electronic expansion valve or a solenoid valve.
The air supplement adjusting method is used for controlling and adjusting the air supplement process of any one of the water chilling units, and comprises a starting adjusting step and an air supplement amount adjusting step, and the motor is prevented from being started with load through the starting adjusting step.
Optionally, the initiating adjustment step comprises:
and before the unit is started, the regulating valve is closed.
Optionally, the air supplement amount adjusting step includes:
adjusting the opening degree of the adjusting valve according to the relation between the exhaust superheat degree Tg and the minimum superheat degree Tm;
adjusting the opening of the adjusting valve according to the relation between the opening of the guide vane of the double-stage compressor and the minimum operation opening;
and adjusting the opening degree of the regulating valve according to the relation between the flash pressure Ps and the intermediate pressure Pz.
Optionally, the adjusting the opening degree of the adjusting valve according to the relation between the exhaust superheat degree Tg and the minimum superheat degree Tm comprises:
a1, measuring the exhaust temperature Tp of the two-stage compressor;
a2, measuring the condensation pressure Pc, and calculating the condensation temperature Tc according to the physical parameters of the refrigerant corresponding to the pressure value in the saturated state;
a3, calculating the exhaust superheat Tg of the two-stage compressor according to the compressor exhaust temperature Tp and the condensation temperature Tc;
a4, comparing the exhaust superheat Tg with the minimum superheat Tm; when Tg is less than or equal to Tm, the opening degree of the regulating valve is reduced; and when Tg is greater than Tm, the opening degree of the regulating valve is increased.
Optionally, the adjusting the opening degree of the regulating valve according to the relation between the opening degree of the guide vane of the two-stage compressor and the minimum operation opening degree comprises:
when the opening degree of the guide vane of the two-stage compressor is smaller than or equal to the minimum operation opening degree, the opening degree of the regulating valve is reduced; and when the opening degree of the guide vane of the double-stage compressor is larger than the minimum operation opening degree, the opening degree of the regulating valve is increased.
Optionally, the adjusting the opening degree of the regulating valve according to the relationship between the flash pressure Ps and the intermediate pressure Pz includes:
when the flash pressure Ps is less than or equal to the intermediate pressure Pz, the opening degree of the regulating valve is reduced;
and when the flash pressure Ps is larger than the intermediate pressure Pz, the opening degree of the regulating valve is increased.
Optionally, the air supplement amount adjusting step includes the steps of:
s1, comparing the relation between the exhaust superheat Tg and the minimum superheat Tm:
s11, when Tg is less than or equal to Tm, the opening degree of the regulating valve is reduced, and the control returns to S1 for comparison again;
s12, when Tg is more than Tm, the next step is carried out;
s2, comparing the guide vane opening and the minimum operation opening of the two-stage compressor:
s21, when the opening degree of the guide vane of the compressor is smaller than or equal to the minimum operation opening degree, the opening degree of the regulating valve is reduced, the air supplement amount of the compressor is reduced, and the operation returns to S1 for re-comparison;
s22, when the guide vane opening degree of the compressor is larger than the minimum operation opening degree, entering the next step;
s3, comparing the relationship between the flash pressure Ps and the intermediate pressure Pz:
s31, when Ps is less than or equal to Pz, the opening of the regulating valve is reduced, and the control returns to S1 for comparison again;
and S32, when Ps is larger than Pz, the opening degree of the regulating valve is increased, and the control returns to S1 for comparison again.
The invention provides a water chilling unit and an air supplement adjusting method thereof, wherein the water chilling unit comprises a two-stage compressor, a condenser, a flash evaporator and an evaporator, an air supplement pipe is arranged between the flash evaporator and the two-stage compressor, an outlet of the air supplement pipe is communicated between a first-stage impeller and a second-stage impeller of the two-stage compressor, and an adjusting valve is arranged in the air supplement pipe; a first pressure sensor is arranged in the condenser, a second pressure sensor is arranged in the evaporator, and a third pressure sensor is arranged in the flash tank; the regulating valve is controlled by comparing the flash pressure (the pressure measured by the third pressure sensor) with the intermediate pressure (the pressure measured by the first pressure sensor and the second pressure sensor is calculated) when the unit operates normally, if the flash pressure is less than or equal to the intermediate pressure, the regulating valve is closed, the air supplement amount is reduced, if the flash pressure is greater than the intermediate pressure, the large regulating valve is opened, the air supplement amount is increased, the pressure ratio of the first-stage impeller and the second-stage impeller is matched, and the operation energy efficiency of the water chilling unit is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of an air make-up control system of a water chilling unit according to the present invention;
FIG. 2 is a schematic view of the flow of the control of the gas make-up to initiate the conditioning step;
fig. 3 is a control flow diagram of an air make-up adjusting method of a water chilling unit according to the present invention.
Fig. 1, a two-stage compressor; 11. a temperature sensor; 12. a first-stage impeller; 13. a secondary impeller; 2. an evaporator; 21. a second pressure sensor; 3. a condenser; 31. a first pressure sensor; 4. a flash tank; 41. a third pressure sensor; 5. and adjusting the valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The invention provides a water chilling unit, which comprises a two-stage compressor 1, a condenser 3, a flash tank 4 and an evaporator 2, wherein an air supplementing pipe is arranged between the flash tank 4 and the two-stage compressor 1, the outlet of the air supplementing pipe is communicated between a first-stage impeller 12 and a second-stage impeller 13 of the two-stage compressor 1, an adjusting valve 5 is arranged in the air supplementing pipe, and the adjusting valve 5 is an electric butterfly valve, an electronic expansion valve or an electromagnetic valve; a first pressure sensor 31 is provided in the condenser 3, a second pressure sensor 21 is provided in the evaporator 2, and a third pressure sensor 41 is provided in the flash tank 4.
The regulating valve 5 is controlled by comparing the flash pressure with the intermediate pressure when the water chilling unit operates normally, if the flash pressure is less than or equal to the intermediate pressure, the regulating valve 5 is closed, the air supplement amount is reduced, if the flash pressure is greater than the intermediate pressure, the regulating valve 5 is opened, the air supplement amount is increased, the pressure ratio of the first-stage impeller 12 and the second-stage impeller 13 is matched more, and the operation energy efficiency of the water chilling unit is improved.
Fig. 1 shows a schematic diagram of air make-up control of a water chilling unit according to an embodiment of the present invention. The air supplement control system of the water chilling unit comprises a double-stage compressor 1, an evaporator 2, a condenser 3, a flash tank 4 and a regulating valve 5, wherein the regulating valve 5 is an electric butterfly valve in the embodiment. The two-stage compressor 1 includes a first-stage impeller 12 and a second-stage impeller 13. A temperature sensor 11 is mounted on the discharge pipe of the two-stage compressor 1 for detecting the compressor discharge temperature, denoted by Tp (in degrees celsius). A second pressure sensor 21, indicated by Pe (in kPa), arranged inside the evaporator 2 for detecting the evaporator pressure; a first pressure sensor 31, provided inside the condenser, for detecting the condenser pressure, indicated with Pc (in kPa); a third pressure sensor 41, provided inside the flash tank 4, is used to detect the flash tank pressure, indicated by Ps (in kPa). The gas-supplementing electric butterfly valve is used for adjusting the flow of gas refrigerant which is supplemented into a secondary impeller of the two-stage compressor 1 from the flash tank 4.
When the air supply device is specifically implemented, the number of the electric butterfly valves can be one or more, and the technicians in the field can set different numbers of air supply electric butterfly valves according to actual needs. The electric butterfly valve can also be an electronic expansion valve or an electromagnetic valve, and the technicians in the field can set different numbers of air supply electronic expansion valves or electromagnetic valves according to actual needs.
As shown in fig. 1, the liquid refrigerant at the bottom of the condenser 3 enters the flash evaporator 4 after first throttling, the liquid refrigerant after flash evaporation enters the evaporator 2 for heat exchange after second throttling, and the gas refrigerant is directly supplemented into the second-stage impeller 13 of the two-stage compressor 1, and is mixed with the gas refrigerant discharged from the first-stage impeller 12 for compression. Wherein, be equipped with the electric butterfly valve on the moisturizing pipe of flash tank 4 to compressor, come the air supplement volume of control compressor through the aperture of adjusting electric butterfly valve.
The invention provides a gas supplementing adjusting method which is used for controlling and adjusting the gas supplementing process of any water chilling unit.
As shown in fig. 2, after the two-stage compressor 1 receives the start command, the micro control system sends a close command to the electric butterfly valve, that is, when the chiller receives the start command, the electric butterfly valve is closed first to prevent the gas refrigerant in the flash tank 4 from being replenished into the two-stage impeller 13 of the two-stage compressor 1, thereby preventing the motor of the two-stage compressor 1 from being started with load.
The air supplement quantity adjusting step comprises:
adjusting the opening degree of the adjusting valve 5 according to the relation between the exhaust superheat degree Tg and the minimum superheat degree Tm;
adjusting the opening degree of the regulating valve 5 according to the relation between the opening degree of the guide vane of the two-stage compressor 1 and the minimum operation opening degree;
the opening degree of the regulating valve 5 is adjusted according to the relationship between the flash pressure Ps and the intermediate pressure Pz. The system intermediate pressure value calculated by the pressures measured by the first pressure sensor and the second pressure sensor is equivalent to the intermediate pressure Pz between the first-stage impeller and the second-stage impeller of the compressor, and can be used for representing the intermediate pressure Pz.
In specific implementation, the condensation pressure Pc is measured by the first pressure sensor 31, and a pressure value signal is transmitted to the micro-control system of the water chilling unit, and the condensation temperature Tc (unit is c) is calculated according to the physical parameters of the R134a refrigerant in a saturated state. Setting the superheat degree of the compressor discharge air as Tg (unit is ℃), and calculating according to the compressor discharge air temperature Tp and the condensation temperature Tc, namely Tg is Tp-Tc; and setting the minimum exhaust superheat degree as Tm (unit of DEG C), judging whether the two-stage compressor 1 operates with liquid or not according to the relation between the exhaust superheat degree Tg and the minimum exhaust superheat degree Tm, and adjusting an electric butterfly valve to avoid the compressor from operating with gas and liquid.
During specific implementation, whether the compressor operates in a low-load state or not is judged according to the opening degree and the minimum operation opening degree of a guide vane of the compressor in the micro-control system of the water chilling unit, the opening degree of an electric butterfly valve is adjusted, the air supplement amount of the compressor is reduced, and the adjustment range of the water chilling unit is widened.
The intermediate pressure of the compressor of the water chilling unit is Pz (unit is kPa), and is calculated by the evaporation pressure Pe and the condensation pressure Pc, namely
And then according to the relation of the intermediate pressure Pz and the flash pressure Ps of the water chilling unit system, the opening of the electric butterfly valve is adjusted, so that the pressure ratio of the first-stage impeller 12 and the second-stage impeller 13 of the double-stage compressor 1 is matched better, and the operation energy efficiency of the unit is improved.
Fig. 3 is a flowchart of a method for controlling air supply of a water chilling unit, and the method for adjusting air supply of the water chilling unit comprises the following steps:
in the first step, the relationship between the compressor discharge superheat Tg and the minimum superheat Tm is compared, and the opening degree of the regulating valve 5 is further adjusted.
When Tg is less than or equal to Tm, judging that the compressor operates with liquid, closing the electric butterfly valve, reducing the air supplement amount of the compressor, and returning to the first step for re-comparison; when Tg is greater than Tm, the compressor is judged to be normally operated, and the next step is carried out.
And secondly, comparing the opening degree of a guide vane of the compressor of the water chilling unit with the minimum operation opening degree, and adjusting the opening degree of the electric butterfly valve according to the size relation of the opening degree and the minimum operation opening degree so as to adjust the air supplement amount of the compressor.
When the opening degree of the guide vane of the compressor is smaller than or equal to the minimum operation opening degree, judging the low-load operation state of the compressor, closing the electric butterfly valve, reducing the air supplement amount of the compressor, returning to the first step for re-comparison, and realizing circulation; and when the opening degree of the guide vane of the compressor is larger than the minimum operation opening degree, judging that the compressor is in a normal operation state, and entering the next step.
And thirdly, comparing the relationship between the flash pressure Ps of the water chilling unit and the intermediate pressure Pz of the system, and adjusting the opening of the electric butterfly valve according to the size relationship of the flash pressure Ps and the intermediate pressure Pz of the system so as to adjust the air supplement amount of the compressor.
When Ps is less than or equal to Pz, the electric butterfly valve is closed, the air supplement amount of the compressor is reduced, and the first step is returned to be compared again, so that circulation is realized; and when Ps is larger than Pz, opening the opening of the electric butterfly valve, increasing the air supplement amount of the compressor, returning to the first step for judging again, and thus realizing circulation.
In specific implementation, the setting range of the minimum exhaust superheat degree is 1-4 ℃, the setting range of the minimum guide vane opening degree is 10% -50%, and the minimum guide vane opening degree can be set by a person skilled in the art according to actual needs.
An electric butterfly valve is added on a gas supplementing pipe from the flash tank 4 to the compressor to adjust the gas supplementing quantity of the compressor. Furthermore, in the starting process of the water chilling unit, the electric butterfly valve is closed firstly, and then the compressor is started, so that the motor is prevented from being started with load. Furthermore, in the running process of the water chilling unit, the air supplement amount of the compressor is preferentially adjusted according to the exhaust superheat degree of the compressor, and the air supplement with liquid running of the compressor is prevented. And further, whether the water chilling unit operates in a low-load state is judged according to the opening degree of the guide vane of the compressor, and the adjusting range of the water chilling unit is widened by reducing the air supplement amount of the compressor. Furthermore, according to the relationship between the flash pressure and the intermediate pressure, the air supplement amount of the compressor is adjusted, so that the pressure ratio of the first-stage impeller 12 and the second-stage impeller 13 is more matched, and the operation energy efficiency of the water chilling unit is improved.
The air compensation amount is adjusted according to the running state of the water chilling unit, and on the premise of preferentially ensuring the running reliability of the unit, the adjusting range of the unit is further widened and the running energy efficiency of the unit is improved. When the compressor runs with liquid (namely the exhaust superheat degree is too low), the electric butterfly valve is turned down to reduce the air supplement amount of the compressor, so that the problem that the compressor is supplied with air and liquid is solved. Particularly, when the water chilling unit operates at low load, the load of the unit is further reduced by reducing the air supplement amount of the compressor, the capacity adjusting range of the unit is widened, and the operation stability of the water chilling unit is improved. Under the normal operating condition, adjust compressor air supplement volume according to the flash pressure and the intermediate pressure of unit, make one-level and second grade impeller 13 pressure ratio more match, improve the unit operation efficiency.
In the description of the invention, it is to be noted that "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing and simplifying the description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. The air supplement adjusting method is characterized by being used for controlling and adjusting the air supplement process of a water chilling unit, wherein the water chilling unit comprises a two-stage compressor, a condenser, a flash evaporator and an evaporator, an air supplement pipe is arranged between the flash evaporator and the two-stage compressor, the outlet of the air supplement pipe is communicated between a first-stage impeller and a second-stage impeller of the two-stage compressor, and an adjusting valve is arranged in the air supplement pipe; a first pressure sensor is arranged in the condenser, a second pressure sensor is arranged in the evaporator, and a third pressure sensor is arranged in the flash tank;
the air supplement adjusting method comprises a starting adjusting step and an air supplement amount adjusting step, and the motor is prevented from being started with load through the starting adjusting step;
wherein, the air supplement amount adjusting step comprises:
adjusting the opening degree of the adjusting valve according to the relation between the exhaust superheat degree Tg and the minimum superheat degree Tm;
adjusting the opening of the adjusting valve according to the relation between the opening of the guide vane of the double-stage compressor and the minimum operation opening;
adjusting the opening degree of the regulating valve according to the relation between the flash pressure Ps and the intermediate pressure Pz;
specifically, the step of adjusting the air supply amount comprises the following steps:
s1, comparing the relation between the exhaust superheat Tg and the minimum superheat Tm:
s11, when Tg is less than or equal to Tm, the opening degree of the regulating valve is reduced, and the control returns to S1 for comparison again;
s12, when Tg is more than Tm, the next step is carried out;
s2, comparing the guide vane opening and the minimum operation opening of the two-stage compressor:
s21, when the opening degree of the guide vane of the compressor is smaller than or equal to the minimum operation opening degree, the opening degree of the regulating valve is reduced, the air supplement amount of the compressor is reduced, and the operation returns to S1 for re-comparison;
s22, when the guide vane opening degree of the compressor is larger than the minimum operation opening degree, entering the next step;
s3, comparing the relationship between the flash pressure Ps and the intermediate pressure Pz:
s31, when Ps is less than or equal to Pz, the opening of the regulating valve is reduced, and the control returns to S1 for comparison again;
and S32, when Ps is larger than Pz, the opening degree of the regulating valve is increased, and the control returns to S1 for comparison again.
2. The method for regulating the supply of qi according to claim 1, wherein the step of initiating regulation comprises:
and before the unit is started, the regulating valve is closed.
3. The gas compensation adjusting method according to claim 1, wherein the adjusting the opening degree of the adjusting valve according to the relation between the exhaust superheat degree Tg and the minimum superheat degree Tm comprises:
a1, measuring the exhaust temperature Tp of the two-stage compressor;
a2, measuring the condensation pressure Pc, and calculating the condensation temperature Tc according to the physical parameters of the refrigerant corresponding to the pressure value in the saturated state;
a3, calculating the exhaust superheat Tg of the two-stage compressor according to the compressor exhaust temperature Tp and the condensation temperature Tc;
a4, comparing the exhaust superheat Tg with the minimum superheat Tm; when Tg is less than or equal to Tm, the opening degree of the regulating valve is reduced; and when Tg is greater than Tm, the opening degree of the regulating valve is increased.
4. The air make-up adjustment method according to claim 1, wherein said adjusting the opening degree of the adjustment valve according to the relation of the opening degree of the guide vane of the two-stage compressor to the minimum operation opening degree comprises:
when the opening degree of the guide vane of the two-stage compressor is smaller than or equal to the minimum operation opening degree, the opening degree of the regulating valve is reduced; and when the opening degree of the guide vane of the double-stage compressor is larger than the minimum operation opening degree, the opening degree of the regulating valve is increased.
5. The gas compensation adjustment method according to claim 1, wherein the adjusting the opening degree of the adjustment valve according to the relationship between the flash pressure Ps and the intermediate pressure Pz comprises:
when the flash pressure Ps is less than or equal to the intermediate pressure Pz, the opening degree of the regulating valve is reduced;
and when the flash pressure Ps is larger than the intermediate pressure Pz, the opening degree of the regulating valve is increased.
6. The method for regulating air make-up according to claim 1, wherein a temperature sensor is provided on the exhaust pipe of the two-stage compressor.
7. The method for regulating air make-up according to claim 1, wherein the regulating valve is an electric butterfly valve, an electronic expansion valve or an electromagnetic valve.
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| CN112629053B (en) * | 2020-12-25 | 2023-06-13 | 青岛海信日立空调系统有限公司 | Water chilling unit and air supplementing control method |
| CN114992801B (en) * | 2022-05-10 | 2024-03-22 | 青岛海尔空调电子有限公司 | Air conditioning system and control method thereof |
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| CN200996753Y (en) * | 2006-12-26 | 2007-12-26 | 海信集团有限公司 | Refrigerating system of intermediate air-compensating compressor with economizer |
| DE102010047823A1 (en) * | 2010-10-07 | 2012-04-12 | Daimler Ag | Air intake for supercharger of internal combustion engine of passenger car, has air guide element arranged in suction pipework system upstream to compressor wheel, where air guide element avoids back flow of air from compressor wheel |
| CN108759211B (en) * | 2018-06-12 | 2020-11-17 | 重庆美的通用制冷设备有限公司 | Two-stage centrifugal unit and middle air supplement control method thereof |
| CN108759212B (en) * | 2018-06-15 | 2020-12-04 | 重庆美的通用制冷设备有限公司 | Shutdown control method and system of water chilling unit and water chilling unit |
| CN109579365B (en) * | 2019-01-16 | 2023-06-20 | 珠海格力电器股份有限公司 | Compressor air supplementing device and method with adjustable air supplementing amount and air conditioner |
| CN111023608A (en) * | 2019-12-30 | 2020-04-17 | 珠海格力电器股份有限公司 | Refrigerating unit with low energy consumption, high efficiency and stability and capable of preventing surge |
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| CN112178965A (en) | 2021-01-05 |
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